@misc{indiciae27ab0611c3a5,
  title = {Characterization of Petroleum Residue in the Entrada Sandstone, Colorado National Monument},
  author = {Paul G. Lillis and J. David King},
  year = {2007},
  doi = {10.3133/ofr20071360},
  url = {https://pubs.usgs.gov/publication/ofr20071360},
  note = {Source identifier: ofr20071360}
}